Dim out other components when UIPickerView is active

In my little iPhone application, I created UITableView with a UIPickerView which dynamically slides up when a cell is tapped. Since I don't want users to tap other cell when choosing value in the UIPickerView, I hope to make it less distractible by dimming out all the other components (the table, the title bar, etc). Kind of like what isolator does.

I think there might be some api method does开发者_开发技巧 this, but I can't find it. Any thoughts are greatly appreciated.

When a cell is tapped you can add another uiview and set its alpha 0.5 and keep uipickerview above it so the background will look dimmed.

If you have call back methods for presenting the picker, then you can disable and enable the user interaction of the root view of the view controller.